snap: add desktop file for remmina command

Author: 3v1n0

snap/snapcraft.yaml

@@ -168,6 +168,7 @@ apps:
       DISABLE_WAYLAND: 1
     command: desktop-launch remmina
     common-id: org.Remmina.desktop
+    desktop: usr/share/applications/org.remmina.Remmina.desktop
     plugs:
       - avahi-observe
       - cups-control